Cylinder-grinding machine



Oct. 2, 1928.

v G. N. SIMPSON cvunman anmnmancnma Filed March 30. 192'! 5 Sheets-Sheet 1 Oct. 2, 1928. 1,686,181

G. N. SIMPSON CYLINDER GRINDING MACHINE Filed March 30, 1927 '5 Sheets-Sheet 2 Oct. 2, I928.

I 1,686,181 a. N. SIMPSON CYLINDER GRINDING MACHINE Filed March so, 1927 5 Sheets-Sheet 3 Oct. 2, 1928.

. 1,686,181 v G. N. SIMPSON CYLINDER GRINDING mourns Filed March so, 1927 5 Sheets-Sheet .4

Oct. 2, 1928.

G; N. SIMPSON CYLINDER GRINDING MACHINE Filed March 30,1927 5 sheets-skeet 5 I I In Q11) in! mu nmm Twin mum III I Patented Oct. 2, 1928.

reaisr GEORGE Lt-"SIMPS ON, or CHICAGO, ILLINOIS.

I CYLINDER-GRINDING mama 7 Application filed March 30, 192). Lesa No. 179.521

This invention relates. to improvements in cylinder grinding machines, and more especially to such a machine, device, or apparatus, forgrinding the insides of relatively longcylinders orflpipes. For example, in the makingfof long hydraulic or pneumatic lifting cylinders, it is-necessary or desirable V cally performed..

to smooth the inside surface. of a relatively long casting or pipe-to make the same true and smooth. By the use of my invention this operation can be efficientlyandeconomi- Y Oneof thefeatures of myinvention is the provision of means for supplying a. substantially constant pressure on the abrasive wheel orfgrinding disk at all times. .In' devices as heretofore made'the'pressure on the grinding disk frequently varies with diff ferent positlons of the disk 1n the" cylinders causmgconsrderable imperfections and unevenness in thework. Inf'my improvedapparatus the pressure on. the grindmg disk is substantially constant at all, times. Another feature ofmy invention is the provision of means for'a'djusting the pressure on the. grinding disk. In general, the grinding disk 2 it in my apparatus is supportedflat one end of a long housing, the driving shaft extending through said housingand being supported therein by two bearings at the ends. At one fend, the. shaft projects beyond the housing and carries thegrinding disk, and at the 7 other endthe shaft projects and carries the driving mechanism. 'The'housing is substantially entirely supported atone or more points between ,the drlvmg mechanism and the l gnndingwheel, preferably at a point rather close.to' the driving mechanism; and the weight ofthe drlving mechanism acts as a;

counterweight to balanceto a certain extent the weight of the housingandshaft carrying .thegrinding disk. By'adjustingjthe effective after.

weight of the driving mechanism the presjsureof the grinding diskionlthe work may be varied" as, desired. ,This feature Will be shown and described more 1n detail hereln In that form of device embodying the [features of my invention shown. in'flthe accompanying drawings,..Figs. 1 and 1t oge'ther form a View in side elevation, a portion .of the cylinder being shown in section to. disclose the grinding disk inside, Fig. '2 isa view taken as indicated by the line 2 of Fig. 1'', Fig. 3 isa View taken as indicated by line 3 of Fig. 1*, Fig. 4 is a top p an Vie of the grinding wheel drive assembly, Fig

[5 is a fragmentary view intop planshowingthe reversing mechanis'mjfor changing f the direction of I rotation of the feed screw which movesthe carriage carrying the grindmg wheel driving mechanism, F1g.'6 1s a "(in I view-taken as indicatedby thelin'e' 6fof Fig. i 7

v5 and Fig. 7is a topplan View of the end of 'thefgrinding wheel sha'ft and housing therefor, showing the 'guardto maintain the the grinder in proper position fromthe time the guard leaves the cylinder until itfagain reenters the cylinder. 5 a

' driving wheel in proper position infthe cylin- 'der, and also showing the means-for holding Figure 8 is a sectional View. taken on the line 88 Qf Fig{ 7, I g I I As shown in the drawings, the main supporting structure consists of two I-beams 10,

10 joined'together by suitable channels 11,- 11. restingjon proper Y foundations 12, 12.- .At one end, the I-beams 10,10 carrytwotransversely arranged I-beams 12%, 12, whichcarrythe main drive; head consistingof a suitable clutch,- chuckor cylinder holding device 13 on the end ofan arbor or shaftl i adapted to be driven through suitablegearingby a ,countershaft 15. carryingla suitable driving wheel or1beltwheelf1'6 which may be rotated in any suitable manner. Ashere shown, the I cylinder holding'device 1 3.comprises aradial arm 17 having a foot17 towhich the. end of a cylinder18. may be attached infany' suitable manner-and appropriately centered by placing blocks ,or shims 19 of requisite thickness.

As here shown, the foot17 jcarries'the plate the shaft 14:, that rotation offthewheel16 Will rotate thecylinder, 1 y V The other end of the cylinder 1s preferably rotatably supported on-an auxiliary. cylinder 20 to'the end of which the'cylinderf 18 is ,fas tened means-ofthe U-bolts 21, 21} will be seen that when the end of the cylinder or pipe 18 issuitablycenteredwith respect to supporting structure 7 comprising; the. two I rollers 22, 22 rotatably. inountedfonfsuitablel I-beams 23transversely arranged, and supportedon the I-beams 10. The pipe is car- I ried between and above these two rollers 22,

22 and is free to rotate thereon as the'same I is rotated by the main drivinghead.

' I Shall now describe the grinding wheel drive assembly. This. includes a. supporting frame or carriage 24-mounted on the four flanged wheels 25, 25 at the front and 25, 25?

at he r ar, a a ted for reoiproeatingmotion on the rails 26, 26 which, in turn, are mounted on suitable foundations 27, 27. Elevation 'ofthe carriage 24 is adjustable by means of the screws 27, 27 at the from, and 275, 27 at the rear, as shown, in order to bring the grinding wheel shaft in proper position with res ect to the particular cylinder to be ground.

he rear end of the carnage 24 isnot mounted directl on the rear wheels 25, 25 but iral'spr rigs 28, 28 are interposed between ewheeis 25, 25 and the rear end of the earria e. The adjusting screws 27, 27 at the 're r of the carriage permit the rear end of thiscarriage tobe raised or lowered to place more or less weight Lonthe wheels 25 through the springs 28, v28. In other Words, the rear wheels 25, 25 are1arranged ee tak eacertain proportion of the weight of the caflfia e 24 on the springs 28, 28'; ,andthe ampunt of weightthus takenis controlled by m'eansof the screws 27", 27 provided with shoulders. engaging the tops of the springs.

It will be seen that in this We, the pressure of the grindin .diskin the cy inderfagainst the work may e adjusted; That is, loweringthe rear end of the carriage 24 will cause a same tofulcrum on the wheels 25 to releve the tgrinding disk from the work; and

raising e'reari end of thecarriage will similarly cause the carriage to fulcrum on the wheels 25ito lower the grinding disk to a a increase itspressure against the work.

. 28, 28 indicates the grinding Wheels arrangted sha Preferably I use along wheel of at least 8 to 10 inches in length, so as to grind the bumps and projections off the pipeandthe surface inside more nearly true. e fact that the grinding wheelQsta-nds a .ponsiderable 'length'of pipe causes it to grind ofir projections and pass over depressions in t 6 ins de surfa'ce of the pipe. By the use of a long wheel, every time. he wheel passes th m mg! the pi c, it will become more nearly smoot than eprevious'timea-nd will become more nearly the same diameter since the portions of the pi with a smaller diame- -.ring to thegrinder or the'grinding wheel, or

it he forward end and anotherbear.-v

wheels, it is tobe understood that I meanthe grinding apparatus. carried atthe end of the grindlngwheel shaft, whether the same consists of. one or more separate wheels. The

grindingwheel 28 is carried on the end of so.

ported ina long hous ng golong shaft .29 sup hearing as indicated by 31 being pro- ,i ig'BZatthe rear The rear end of the shaft- 29 is preferably directly connected to a'drivmg mechanism, for example an elecon the end ofthe grinding wheel tricmotor 31Pmounted the carriage'24. The rear end of the housing 30 is suitably supported on the carriage,'preferably at a Point or points substantially above the front wheels 25. As here shown, the rear end of the housing 30 iscarried bythe straps 35 fastened by means of the bolts 36 to the members 37 resting on the carriage 24; Prefer ably, the bearings in the housing at each end are oil tight or fairly so.. If desired, one or more additional bearings may be provided in the housing between the ends thereof. It will be seen that the weight of the rear end of the carriage 24 and the motor 31 act as a sort of cantilever or counterweight to balance the forward end of the housing 30 and grinding wheel 28. 'In other words, the en.-

tire grinding wheel drive assembly'can rock or fulcrum to a certain extent on thefo'rward' wheels 25,"such'motion being adjusted by means of the rear screws 27 a to raiseor lower the rear end of the carriage to increase or lessen the downward pressure of t hegrlnding wheel 28 It will be seen, howeven'that such pressure, no matter how adjusted, will be constant no matter what is the position of the carriage 24011 the rails 26. In thegrinding operation, the grinding wheel 28 is reciprocate'd back and forth through the pipe bymeans of the feed screw33 driven by the shaft 34through the reversing mechanism 35 (see Fig. 5). The shaft 34 may be driven in any suitable manner asby means oft-he chain 36 froni the shaft 14. The'reversing mechanism comprises'two trains of screw 33. One of theseis a; direct drive through thc'gears 38,38 and the other isa gearing connecting the shaft 34 andthe feed.

for engaging the direct drive and the other for the reverse. One or the other ofthese clutches is adapted to be engaged by means of the operating rod 4'3 carrying thetwo collars 44 and 45 near the forward, and rear ends thereof. The carriage 24 carries arm 46 "have ing a. head 47 surrounding \the rod 43' and adapted to engagethe collars'44 and 45 at the forward and rear ends of its travel respec; tively, in order to throw in the reverse gear and forward gear respectively, to cause the feed screw 33 to reverse its rotation to cause the carriage 24 to travel back and forth on the rails 26.

One of the big prob lems in the type of 7 cylinder grindin machine shown is to pre vent vibration of the grinding wheel orstone as it performs its work. It has been'found 3 that'if the stone lies at the bottom of" the cylinder during the grinding, it has a tendency to, run up one side or the other and fall back, thus causing chattering, vvibrating or shaking. In order to preventthis vibrate ing Ipro idea guard 50 attached to'thc end of the housing30 near its forward end. The 'guard'50 'preferably has its end enlarged as v indicated by 50 ",s-and is adapted to rest-.or

bearagainst "the side of the-cylinder 18 in order to holdfthegrinding-"wheel "28 to one side of the bottom. In otherwords,the guard 50 is 'of'sufiicient length so that when it is in contacuwiththe inside of the pipe, the

wheel 28 is held over to oneside ofthe pipe beyond the centerline, far enough so that its tendency to run'back to the bottom of the I pipe and thus vibrate, is prevented: 'It'has been found that the use of such a guard 50 with a propera'djustment prevents all-tendency to vibrate. Y i

It willbe seen by 'referenc'e'to Fig, 7 that with the construction asshown, if the grind ing wheel- 28 is moved to" the extreme end 18* of the cylinder, the guard 50 will come out of the end of the cylinder. When thus out of the cylinder, there must be provided adv ditional means to prevent chattering of the wheel 28 and to hold the wheel in proper posi- "tion so when the carriage 24- starts forward again, the guard will enter the end of the cylinder. 'Such means comprise co-operating guide members 55 and 56, the former mounted on a suitable support'57 carried by the forward ends of the rails 26, and the latter comprising a strip welded or otherwise suitably attached to the forward end'of the housing 30 on the same side as the guard 50. The strip 56 is preferably a rather long member; and the member 55 is similarly shaped and has its forward end preferably outwardly turned as indicated at 55*. It will be seen (Fig. 7 that as the grinding wheel 28 nears the end i of the cylinder, the guide 56 will engage the guide 55 to take the strain from the guard and hold the wheel 28 in proper position. These guides and 56 will remain in contact and perform this work from the time the guard 50 leaves the end of the cylinder until it again re-enters. I

While I have shown and described certain embodiments of my invention, it is to be understood that it is capable of'many modifi cations. Changes, therefore, in the construction and arrangement'may be made wlthout departing from the spirit and scopeof the invention as disclosed in the accompanying claims, in which it is my intention to claim all novelty inherent in my invention as broad- 1y as possible in view of the prior art. 7

WhatI claim as new, and desire to secure by Letters Patent, is:

1. In a cylinder grinding machine of the character described; means for supporting and rotating a cylinder; a, grinding wheel shaft adapted to enter the -cylinder; a housing for the grinding wheel shaft, said shaft projecting beyond the end of'said housing and supported in a bearing carried by the end ofthe housing; a grinding wheel on the projecting forward end of the shaft; means for rotating the I grinding wheel shaft; means for "reciprocating the grinding Wheel ion-- shaftyadapted to enter the cylinder;aihous- King for the grinding whe-elshaft; saidlshaft projecting beyond the end-"of said housing and supported in a. bearing carried by -the 'gitudinallyin; the cylinder; and means: for holding thejgrinding wheel away fromuthe bottom of thecylindensaid means compris .ing a horizontally arranged guard arm havend of thehousing; a grinding wheel on the V projecting forward end of the shaft; means for rotating the grinding wheel, shaft; means dinally in the cylinder; means for holding the grinding wheel away from thebottom of the cylinder and means to hold the grinding I [wheelin position from the time the same j leaves the end of the cylinder until it again re-enters, said means including co-operating guide members, one being a stationary member beyond the end of the cylinder and the other a member on the housing, said guide members adapted toengage to hold the grinding wheel in position from the time the guard leaves the cylinder'untilj it again re-enters.

3. In a cylinder grinding machine of the character, described; means for supporting and rotating a cylinder; a grinding wheel shaft 'adaptedto enter the cylinder; 'a housing for the grinding wheel shaft, said shaft projecting beyond the end of said housing and supported in a bearing carried by the end} of the housing; a grinding wheel on the profor reciprocating the grindingwheel longitu- 7 jecting forward end of the shaft; means for s a rotating the grinding wheel shaft; means for reciprocatingthe grinding wheel longitudinally in the cylinder; meansfor holding the 1 grinding wheel away from the bottom of the cylinder, said means comprising a guard I member attached to the housing and adapted to bear againstthe inside wall of the cylinder to preventthe grinding wheel from resting on the bottom of the cylinder; and means for holding the guard in position from the time the same leaves the-end of the cylinder until it again re-enters, said means comprislng co-operatlng guidemembers, one being stationary and mounted beyond the end of the cylinder and the other being carried on the housing, said guide members adapted to" engage to hold the guard in position from thetime it leavesthe end of the cylinder until it again re-entersf I 4C. In a cylinder character described; means for supporting and rotating a cylinder ;'algrinding wheel grindingmachine of the v 4; i Y n 1,688,181

; ailongitudimwlfiy retaipnocabfliercanriage any reoiprocable carriage isnpiportinggsa id suppomtingsaid sh'azft atone endi;''mnt and housing at one end; front a-nd rear'suppo rt's 2 rear mvppoits forkm'id .earr1iage.;: driwing for said carriage; :driVingJmeansf-Or said i means for'said shafft mounted on smizdcmrshaft mounted on said carriage; a grinding I a gnmdzhxg wheel on the-tithe:- 'end of wheel on the other end of said shaft'admpted shaft adapt ed to enter the cylinder and 'bo enter the cylinder and be reciproesutedlonhmecipmabedlonQtudinfll-ky thereiinhy said :gitudi-nzilly therein by saidflcairmwge; the 2 nfringe; flmtdm'iving Pmeans acting as :a driving means acting as mcanti'leve weight 'mtilevur weight \to balance rthe weight-0f the tb'balance the weight of the end of the housolldlof theshwft cflrrying bl'le grinding wheel, ing and sha'fit carrying the grinding. whee-1,

the'front supports of the carriage acting as a flie front support for the carriage acting as and meimszfim' 'vanyingmhe efiective a fulcrum; and means for varying mhe efiec- R 7 the driving means it) wary mhe mive'wei-ght of the driving means 'to vary the gninilling ipmessulte of the wheel. grinding pressure ofthe grinding Wheel.

5. .15 ra 'cylinder .gr'mding tmadhsimmoif the In witness whereof, I have hereunto set A. w n described; means far supporting myrhand 'thisr24th dayrof Mar-ch, 1192K." udmotdting a dylinderyagvrimd ingwheel shaft; a-housing sforaiid shaftz'mlunzitndi- GEORGE-N; SIMPSQN; 

